Restrictions on audience list modification

When you try to modify an existing list - there are some restrictions in place on how that list can be modified. Here is a list of restrictions:

• PII attribute columns cannot be modified to change types.

• Unique ID columns cannot be modified to change types.

• You cannot add a new PII attribute column type on a data list.

• A numeric column can only be changed to Day, Month or Year - these cannot be modified to change type to Numbers & Letters.

• Date Timezone column types cannot be changed

• Other PII [Plain Hash] Column Types cannot be changed